巻号一覧
52 巻, 1 号
選択された号の論文の9件中1～9を表示しています
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研究論文
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桜田 大輔, 加藤 数良, 時末 光2002 年 52 巻 1 号 p. 2-6
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリーThe some characteristics of the underwater friction welded joints of 6061 aluminum alloy, which were made by using a brake type friction welding machine, were examined with different welding conditions. The highest temperature of the friction welding process on the underwater welding was considerably lower than that of the atmospheric welding, and both friction pressure and friction time did not hardly affected to the temperature on the friction welding process. The total loss of the underwater welded joint became smaller compared with atmospheric welded joint, moreover the width of softening area on the underwater welded joint reduced and the softening ratio also decreased. The maximum joint efficiency of the underwater welded joint could be obtained 86%, it was slightly lager than that of the atmospheric welded joint which was 82%. The elongation of the underwater welded joints were lower than that of the atmospheric welded joint. Both the underwater and atmospheric welded joints fractured in the softened area under the tensile load.抄録全体を表示PDF形式でダウンロード (1656K) -
澤井 猛, 小川 恒一, 山口 博, 越智 秀, 山本 義秋, 菅 泰雄2002 年 52 巻 1 号 p. 7-11
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリーFriction welding of 6061 aluminum alloy similar material was carried out in order to examine the relationship between diameter of base material and heat input. By using the base materials having 10, 12, 14 and 16 mm diameters respectively, experiments were carried out by the brake type friction welding machine under various friction welding conditions. The joint strength was evaluated by tensile test, while the unit deformation heat input in the upset stage was adopted as the heat input. The relationships between heat input and joint strength, and heat input and upset loss were examined respectively. The results obtained indicated that the unit deformation heat input in the upset stage is more related with the joint strength of the welded joints produced with all diameters adapted, and the minimum-limit unit deformation heat input for perfect joint increases with an increase of diameter of the base material, while, the minimum-limit unit deformation heat input per area for perfect joint of base material fracture is almost constant 1.6 × 106 J/m2 s. Moreover it was recognized that the evaluation of the joint strength is possible by the upset loss, therefore, the minimum-limit upset loss for perfect joint is about 5 mm.抄録全体を表示PDF形式でダウンロード (1163K) -
鄒 勇, 佐治 重興, 草開 清志2002 年 52 巻 1 号 p. 12-17
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリーPure elemental powders of Al, Fe and Cr corresponding to the compositions of Al90–xFexCr10 (x= 10, 25, 50) were mechanically alloyed by high-energy ball mill using a ball-to-powder weight ratio of 250:10. The structural evolution in these alloys was investigated by X-ray diffraction and transmission electron microscopy. Additionally, thermal stability of the mechanically-alloyed powders was tested by DSG. Amorphous phase was partially formed in Al65 Fe25Cr10 and Al4OFe50Cr10 mechanically-alloyed powders at the early stage of milling. Al5(Fe, Cr)2 and Al(Fe, Cr) compounds were formed in the middle stage of milling. In the last milling stage, a mixture of amorphous and nanocrystal was obtained in Al80Fe10Cr10 and Al65Fe25Cr10 mechanically-alloyed powders. Only nanocrystal was observed in Al40Fe50Cr10 mechanically-alloyed powder after long time milling. The crystallization temperature of these amorphous phases is about 150 K higher than that of the amorphous phase in Al–25 at%Fe binary system. It is proposed that the existence of Al–Cr atomic cluster in the amorphous matrix can improve the thermal stability of the amorphous matrix.抄録全体を表示PDF形式でダウンロード (1658K) -
甲藤 晴康, 橋本 暁生, 北岡 山治, 鞘師 守, 塩田 正彦2002 年 52 巻 1 号 p. 18-23
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリーThe relation between the casting temperature and the size of primary silicon particles of hyper-eutectic Al–Si alloys was studied to understand the behavior of phosphorus in the melt, when phosphorus is added, primary silicon particles are refined as long as the casting temperature exceeds the temperature “T”, defined as “the critical temperature for grain refinement” T is expressed as T(K) = 23 × Si(mass%) + 630. However, they are coarsened as the casting temperature decreases in the temperature ranges between T and liquidus. when phosphorus is added, the grains are not refined and are not affected by the casting temperature. Temperature T is considered as the temperature at which AlP compounds begin to grow and agglomerate, and it is a useful index for determinin the casting temperature.抄録全体を表示PDF形式でダウンロード (3768K) -
穴田 博, 小林 寛史, 佐治 重興2002 年 52 巻 1 号 p. 24-28
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリーThe distribution of crystal grains for 6061 DC billets cast using the float was studied, the results were as follows; the fine crystal grains were near the center of billets and the coarse one was near the edge of float. These results suggest that metal flow in mold affected to the grain refining effects of DC billets. To examine the molten metal flow in mold, we used by water model experiment and made clear the relation between float design and the metal flows. It was confirmed that the metal flow at the neighborhood of mold center was as strong as origination of vortexes on the solidifying surface, which was strong with decreasing float diameter. The grain refining effect at center zone of DC billets is presumed to the subdivision of dendrite arms produced by a steering flow at the solidifying surface and the distribution of the dendrite segments over the mold.抄録全体を表示PDF形式でダウンロード (2580K) -
田中 宏樹, 箕田 正, 江崎 宏樹, 渋江 和久, 吉田 英雄2002 年 52 巻 1 号 p. 29-33
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリー7xxx alloy fine grained sheets produced by a warm rolling method were investigated on its micro structure and bulk properties comparing with cold rolled sheets of AA7475 alloy. The warm rolled sheets kept the fine structure less than 3 μm after solution heat treatment. This structure was recognized by EBSP measurement as a sub-grain structure with a high proportion of low-angle boundary less than 15° while the cold rolled sheets had a high proportion of high-angle boundary over 15°. It was also a unique property that the texture of the warm rolled sheets consisted mainly of the β–fiber after solution heat treatment. A cross rolling method was applied for reducing anisotropy on polarized optical micrograph and led to successful results. In addition, it was found that the {011} <322> orientation was formed strongly by the cross rolling. The {011} <322> orientation was kept after solution heat treatment in the warm cross rolled sheets, but the cold cross rolled sheets formed a recrystallization texture without any strong components. The strength of the warm rolled sheets aged at 120°C increased about 10% comparing with that of the cold rolled sheets. The most important result in this study was that the property of resistance to SCC of the warm rolled sheets improved considerably. The reason of the above result was probably due to intermittent precipitation at grain boundaries on the warm rolled sheets in T6 condition.抄録全体を表示PDF形式でダウンロード (2342K)
解説
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藤嶋 昭2002 年 52 巻 1 号 p. 34-37
発行日: 2002年
公開日: 2007/03/30
ジャーナル フリーPDF形式でダウンロード (736K)
連載講座
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上山 智之2002 年 52 巻 1 号 p. 40-42
発行日: 2002/01/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (876K) -
上野 保, 横井 哲郎2002 年 52 巻 1 号 p. 43-45
発行日: 2002/01/30
公開日: 2021/06/30
ジャーナル フリーPDF形式でダウンロード (846K)
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